//! App lifecycle state types.
//!
//! `App` owns the suspend/resume state machine and exposes
//! `App::suspend` / `App::resume` directly. Plugins driving those
//! transitions from inside an event handler write the
//! [`SuspendRequest`] resource into `World`; `App::tick` drains it
//! at the end of each frame and dispatches the matching call.
/// Plugin → App bridge for triggering suspend / resume from inside an
/// event handler.